Toys that require skills to play were very poplular as a double checkbox gift (playtime is learning time).  This Portable Organ from SUN manufacturing of Japan (we could find no information on this company) has some clever features to spotlight.

First when the hinged clear acrylic keyboard cover is raised a hidded pressure switch activates the battery operated blower motor.  This blower sends air into the organ which is released to a tuned note when any of the 14 white keys and/or 10 black keys is depressed.  You can press multiple keys and the little battery powered motor can punch above its weight and give you a symphony (talent required).

Special Note:  My cat who is 99.9% mellow absolutely hates the sound this organ makes ... like it changes her personality completely, weird, and a little scary so I dont demo this toy (much).